Flying form

ABSTRACT

A knockdown flying form quickly assembled and disassembled at a building site and providing as a unit a unitary form having guided metal to metal roll-out contact with adjustable form supports for pouring successive floor slabs of reinforced concrete. Laterally spaced I-beams permanently trimmed with wood strips support equally spaced saddle hangers that are interconnected by laminated wood joists whose ends vertically overlap and square the I-beams as well as provide a low profile with their vertically spaced rails disposed well above the upper and lower flanges, respectively, of the I-beams. The metal members have rigid wood-to-steel engagement at all points of readily releasable interengagements.

[ Nov. 4, 1975 United States Patent [191 ffet al.

Ratcli FLYING FORM [75] Inventors: Felix E. Ratcliff, Los Angeles;Pierce J. Walinsky, Sunnyvale, both of Calif.

[73] Assignee: Waco Scaffold & Shoring C0.,

754,303 10/1954 United Kingdom...................52/642 PrimaryExaminer-Francis S. Husar Schiller Park, Ill. Assistant Examiner-CarlRowold June 12, 1974 Attorney, Agent, or FirmWatson D. Harbaugh [22]Filed:

.31 yS .E UCID. .nou M mm wmm n nmd fi o w mw M m nmrem mi r. ewm f M Sn m mww .w p kd em Ckmmuc u m qewmfy .n mu 5 m m mm g m m et m m w m nl.mts .WJUVSIOB am a hdQS mmmm m do m b e O C d n m/mmm mmw wAmmuccw.HRMAJ m 9 3 17 9Q B2 49G 4 449M .920 4 E 5 2 .9 9 8 R M B 9 1B1 8 W HG41 m m 2 E n 1 m m 6 u 9 5 8 m "b2 7 u mcw A mmm o u m N 1. P L d W SLd A U mm .1 .J] l 2 8 2 5 55 FL support equally spaced saddle hangersthat are inter- References Cited connected by laminated wood joistswhose ends verti- UNITED STATES PATENT S cally overlap and square theI-beams as well as provide a low profile with their vertically spacedrails disposed well above the upper and lower flanges, respec- 249/13tively, of the I-beams. The metal members have rigid 249/219 R Xwood-to-steel engagement at all points of readily re- 249/219 R leasableinterengagements. 249/219 R 3,170,217 Williams 3,397,858 Williams3,504,879 Strickland 3,776,499

3,843,084 974 Gregory et 3,863,877

14 Claims, 10 Drawing Figures Gregory US. Patent Nov. 4, 1975 Sheet 1 of3 3,917,214

FIG I US. Patent Nov.4, 1975 SheetZ 0f3 3,917,214

FLYING FORM BACKGROUND OF INVENTION Many problems confront the buildingindustry with the conventional flying forms with regard toreadyassembly, economy, stability and reusability. Knock apart woodassemblies have short lives and the waste of time and material is high.Welding and flame cutting of steel generally involved at a building siteare extensive. Moreover, once assembly-welded and then disassembled byflame cutting, the parts are not the same for ready assembly at a newsite.

Disassembly of flying forms is necessary because of their size. Even iflight enough, they can only be transported intact, from site to site, byhelicopter if expense is no objection. Delays incurred because of neededrepairs are quite expensive where a timed building sequence isinterrupted. Welded metal-t'o-metal securements are difficult and timeconsuming to repair. With the likelihood of such contingencies arisingtheir cost is reflected in bid prices. In both events the building costis substantially high even though savings are being accomplished withconventional flying forms over earlier practices.

Futhermore, difficulty has been experienced with fastening plywoodflooring to steel beams as well as securing the steel beams to I-beamsfor a knockdown assembly. This is particularly true when endeavoring tominimize the overall height of the formwork. by a substantial verticalcompacting of the coacting elements.

It is also to be noted that since formwork plywood panels must besupported on minimum joist centers related to the thickness of the floorslab to be poured, the weight of the formwork is materially greater withmetal joists. In fact, motorized lifts are generally required to handlethe metal joists individually during assembly as distinguished frombeing light enough to be dropped in by hand, as in the presentinvention, and bolted into place without need for a lift or cranehandling them.

SUMMARY OF INVENTION The present invention relates to site assembled anddisassembled formwork for the pouring of successive concrete floor slabssupported on rollout column supports which are more particularlydescribed in Mocny, et al., application Ser. No. 322,969. Once assembledthe formwork sections are used as a unit supported for pouring one floorslab and then lowered and rolled out horizontally by a crane, lifted andagain set in place on formwork supports above the first slab for thepouring of the next slab. Hence, they are referred to as flying forms.

Although channel beams can be used in the flying forms in the presentinvention because the beams are restrained throughout their lengthagainst lateral flexure and rotation, it is preferred to use rolledsteel 1- beams with moderately wide flanges on the two main beamsbecause of their lateral stability with assembled parts for knockdownstorage or shipment between light laminated wood joists formed in an Icrosssectional configuration with top and bottom rails connected by avertical web. The joists are of exact length, and their square ends dropinto place in the saddle brackets with the top and bottom rails disposedsubstantially above the respective upper and lower flanges of the mainbeams. The joists ends square the opposing sides of the I-beams.

When assembled the ends of the joists are not only disposed as mentionedbut are also bolted to the brackets to serve dually as compression andtension members that unitize the assembly for handling by a crane withspread lift cables temporarily secured to the corners of the form toroll it out, to fly it, and position it for the next floor slab pouring.

The brackets project laterally at an elevation between flanges and arepreferably secured by bolts to the main beams. Then when the beams aretransported knocked down they can rest side by side with the brackets onthe one side of one beam nested in the channel of the adjacent beam.

An object of the invention is to provide a vertically compacted profileso that the form may be lowered a long distance onto roll-out rollersupports thereby not only avoiding horizontal movement interference withthe bottom of the floor slab completed above it but permitting dependingprotuberances or reinforcing shapes to be integrally cast and used bythe contractor in the design of the building.

A further object is to provide light flying forms which can be adjustedinitially into final orientation on prelevelled rollers provided inMocny, et al., Ser. No. 322,969 and then contacted thereafter by thestationary shoe supports with a given number of turns of a winged nutfor proper final elevation, it being much easier to determine thelevelling of the form supports before the form is lowered into place.

Additionally, joists of exact length ready for assembly are used, but ifany shortening thereof is required it is easily done by a power saw asdistinguished from cutting metal and welding it as required withfabricated metal joist. Moreover, the light joists are easier to handlewithout a power lift. Also the joists can be inverted from time to timeto utilize both rails in nailing and the longevity thus expected canextend over a period of time involving the pouring of over a hundredfloors. If a joist is weakened by damage, it is easily repaired on thejob even though already in working position.

IN THE DRAWINGS FIG. 1 is a plan view of a flying form as placed inworking position between two rows of a plurality of support columnsdefining a roll-out path.

FIG. 2 is a plan view of a couple of flying forms as placed in workingposition between successive rows of support columns defining at leasttwo roll-out paths with a space between the forms intermediate twocolumns.

FIG. 3 is a segmented end view of a flying form as assembled onlevelling blocks before being lifted into place as shown in FIGS. 1 or2.

FIG. 4 is a sectional view from below the flying form as indicated atline 4-4 in FIG. 2 showing the formwork supports on opposite sides of asupport column.

FIG. 5 is a view from below as indicated at line 5-5 in FIG. 2 showingthe formwork support screw jack as engaged by the I-beams of theformwork.

FIG. 6 is a perspective view partially in section showing the assembledrelation of the joists with the I- beams.

FIG. 7 is a sectional view taken on the line 77 in FIG. 6.

FIG. 8 is a sectional view taken on the line 8-8 in FIG. 7.

FIG. 9 is a sectional view taken on the line,99 in FIG. 7, and

FIG. 10 is an exploded view of the joist and bracket 1 support jointshown in FIG. 6.

DESCRIPTION OF PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, in themaking of a monolithic concrete building, at least four'spaced concretefloor support columns 12, six are illustrated, have four support screwjacks l4 temporarily secured thereto on opposite sides of each column asillustrated in FIG. 4. The mounting of the screw jacks determines therollout paths for the forms. FIG. 1 illustrates a long form 11 whichbridges two bays 21 and rolls parallel therewith as indicated by arrow19. FIG. 2 shows two forms across two bays 21 which roll in thedirection of the arrows 23 with respect thereto. The spacing of thecolumns in both directions in either case determines in part the lengthand spacing of the I-beams 28 which lengths are preferably related inpart to the 4 by 8 feet dimensions of veneer boards used as flooring forthe form as well as the spacing of the screw jacks.

The assembly of the knockdown flying form 11 embodying the invention ispreferably made upon the ground as illustrated in FIG. 3. For thispurpose corner blocks 25 are laid upon the ground 13 and levelled whereworkmen have easy mobility and walking access to all of the partsinvolved.

Accordingly, two I-beams 28 are located in place in their properlyspaced and levelled positions on the blocks 25 for the assembly of theformwork. These beams are of a length suitable to span one or two bays21 between the columns 12 and if there are more bays, other sections ofthe formwork are assembled and successively lifted into place toend-abut and be temporarily bolted end-to-end to the others for thepouring of the concrete.

The I-beams 28, once located properly in place have wood scantlings 32(FIG. 7) secured permanently in place end-to-end on the top flanges 34of the I-beams 28 by power driven metal piercing nails 36. Wood strips38 are likewise secured to the facing sides of the I-beam webs 40 at adistance from the bottom flange 42 predetermined to clear the sideguides 26 on the screw jacks. The horizontal dimension of the scantlings32 equals the exposed width of the top flange 34 above it to define avertical plane 44 at its edge. The wood may be dressed or undressed,whichever is available and less expensive and nail heads are reinforcedby discs 37.

Brackets 46 are received along the scantlings 32 at spaced distancesdetermined somewhat by the expected load of the flowing concrete whenpoured in place to become a floor slab. For their support they areprovided with horizontal flanges 48 resting on the upper face 50 of thescantling 32. The flanges 48 are apertured at 49 (FIG. 10) to receivedwood screws 52 releasably securing them in place with vertical flanges54 of the bracket disposed in said vertical plane 44' and against theopposing vertical faces of the laterally spaced scantlings 32.

A U-shaped strap forming a stirrup 56 (FIG. 10) disposed at a rightangle to each vertical flange 54 has its upper edges 58 welded asat 60to the vertical flange 54 to provide slings 62 receiving. cross joists64 between the beams 28.'At the lower and closed end 66 of the stirrup astrap 68 disposed in the vertical plane is welded at to the sling 62 andapertured at 67 close to the sides of the stirrup 56 for securement tothe strip 38 by removable bolts 70. The brackets 46 can be.

spaced differently at sites different in. relation to the load they willbe required to bear and other dimensions from above, manually ifdesired, into the stirrups 56. i

and then to rest at their ends in supported relation against thevertical flange 54 and strap 68 in squared relation. Filler blocks 78,preferably of hardwood with their grain perferably disposed vertically,extend from rail 72 to rail 74 at both ends of the joist 64 and on bothsides of the web 76 to fill the space between the .web

76 and the sides of the stirrups 56 for plumb alignment purposes at thetop. When dropped into place openings 80 through the blocks 78 andopenings 67 through the.

sides of the stirrups 56 coincide equidistant from the rails 72 and 74.They receive the bolts 70 which clamp the assembled parts in place towithstand compression and tension forces inter-exerted between theI-beamS 28 and the joists.

The frame of the form thus fashioned is ready to receive the veneerpanels 84 on top of the rails 72 of the joists 64 which are wide enoughfor a good support for abutting ends of the veneer boards. The veneerpanels 84 are cut, laid in place and then secured to the top rail 72 bya power nailer using flat headed wood nails for ready pull-out whendesired.

Heavy eyebolts 17 are installed in the I-beam web 40 at opposite ends toreceive snatch hooks 88 for a pyramidal cable sling with suitablespreaders to lift the formwork into place on the rollers 18.

By the time the formwork is ready for mounting on the form support screwjacks 16 the rollers 18 are preferably first levelled to receive theformwork rollably thereon as more particularly described in Mocny, etal., Ser. No. 322,969 with the guides 26 on the shoe supports 22adjacent to each other. The flying form is then crane lifted into placeon the rollers for a metal-tometal rolling contact therewith and movedinto final position, either byitself or in end-abutting relation withanother form to which it is then bolted. Thereafter the stationary shoesupports22 are raised equal distances frombelow to support the form andhold them in correct position against further movement.

The open spaces 30 (FIG. 4) between laterally spaced forms (FIG. .2)intermediate the columns may be closed by plywood panels 90 bridging andresting on the exposed ends of top rails 72 of the joists but preferablyare supported by small frames 92 resting on the exposed scantlings .32.Thereby the vertical space between the upper rail 72 and thescantling-32 receive a lay-in frame 92 of shop lumber or short 2 X4-inch members supports narrow veneer panels 90 level with the otherveneer panels 84. The lay-in frame 92 is then freed to be removed whenone of the forms lateral thereto is lowered its full predetermineddistance. This permits one edge of the narrow frame 92 to swing down atthat side and free itself for removal intact for reuse.

After the pouring and the setting of the floor slab, the two formworkassemblies are unbolted and the one that is to be flown first is loweredall the way by the screw jacks 14 including the winged nut to ultimatelyrest on the rollers. This frees the narrow panel for removal whereuponthe sling cables 88 are fished through the vertical space thus providedbetween the floor slab and form and attached to the eyebolts 17. Theflying form is then rolled out until it is crane borne and lifted to itsnew position. This procedure is repeated for the remaining forms.

The invention will be further understood in view of further advantagesattained thereby generally relating to longevity and easy usability.

Hardwood filler blocks and wide rails:

a. Carry the weight locallized on wide top and bottom rails at theirends to save the web against buckling and damage;

b. They protect with substantial thickness the web against side sway andtwisting as well as bumps encountered by the head rail above the sidesupports of the saddle as when plywood panels are slid into place;

0. They coact with plywood floor panelling to strengthen against tearouts when the formwork is being handled as a flying form" by a crane;

d. Wooden joists exactly space the steel I-beams for accuracy throughoutlong use in the successive pouring of floor slabs;

e. They provide nail receiving supports for securing the plywood witheither rail disposed upwardly, thereby doubling longevity.

The arrangement shown with the bottom rail located above the bottomflange and the top rail above the scantling:

a. Substantial vertical compaction and greater joint areas are attained;

b. Exposes the bottom l-beam flange for metal-tometal roll out as guidedby side guides on the rollout support, without any side guides extendingabove the bottom flange interferring with the bottom rails;

c. Metal-to-metal roll-out contact has many advantages over the oldmetal roller-to-wood beam arrangement. Narrow wood beams would not bestrong enough;

d. The drop of the I-beams by the screw jacks can be very substantial sothat the formwork upon roll-out clears the bottom of the floor slab andany irregularities or depending protuberances intentionally provided onthe lower surface thereof;

e. Parallel l-beams provide for easy roll-out;

f. Channel beams can be used if clearances are tight;

g. Joists cross brace the I-beams against rotation or bowing under load;

In storage or transportation lateral resting of brackets on one l-beamin the channel of the next beam beside it provides compactness forshipping or storage with the brackets left in place for repeated uses.

The arrangement shown with the top rails above the scantling providesvertical space within which to support the ends of lumber on thescantlings to carry veneer panels bridging the space between laterallyadjacent formwork members across lateral bays between support columns.

What is claimed is:

1. Prefabricated knockdown roll-out formwork for support on height andlevel adjustable screw jacks having heads including rollers defining aroll-out path and friction shoes adjustable to support said formworkabove said rollers a predetermined distance is said path, said formworkcomprising: parallel spaced metal beams resting on said jacks and havingcoplanar head and, bottom flanges, each beam having a nailable header ofsubstantial thickness secured to the upper face of its head flange and aside strip of nailable material spaced above the bottom flanges andsecured to the beams on facing sides of the two beams, said side striphaving a horizontal thickness substantially coextensive with the lateralextension of each head flange to define with the headers verticalparallel planes;

hanger means spaced along the headers in manner facing each other inpairs and having horizontal portions releasably secured against the topsurfaces of the respective headers and vertical flanges lying in one ofsaid vertical planes, and hanger means including depending stirrupmembers with upper portions secured to said vertical flanges andhorizontal strap means secured to lower portions thereof and releasablyfastened to said side strip;

laminated wood joist means defining nailable head and bottom railsinterconnected by a web and having a height greater than the verticaldepth of said stirrup members to locate the head rails a substantialdistance above said head flange with the lower rail located well abovethe lower flange;

means including bolts releasably securing the ends of said joist meansbetween the sides of the stirrup members against relative tension andcompression forces exerted between said beams and said joist means; and

plywood panel means secured to the head rails of said joisst means tosupport poured concrete for a floor slab and to brace said formworkagainst horizontal strains.

2. The construction defined in claim 1 in which said joist meansincluding said joist rails on opposite sides of the web engage the sidesof said stirrup member under compression and have aperture meanstherethrough for the bolt means arranged equidistant from said rails forinverted reuse of the joist means in said stirrup members.

3. The construction defined in claim 2 in which said joist means aresquare at their ends and collectively engage said headers and strips toplumb the beams and support them against rotation under load as theyrest upon the screw jack heads and when the formwork is supported bycrane at formwork corners.

4. The construction defined in claim 2 in which said filler blocks andrails at the joists include plywood panel elements extending across saidwood headers and are supported in abutting relation with said plywoodpanel means by said filler blocks and rail ends of said joists.

5. A flying form comprising:

a pair of parallel spaced metal beams disposed with parallel flangesalong the head and bottom of their webs, respectively;

a wood header of substantial thickness rigidly secured to the upper faceof the head flange and colevel wood strips secured a spaced distanceabove the bottom flange against the facing sides of said beam webs, saidstrips having a horizontal thickness substantially equal to the width ofeach head flange to define with the head flanges a pair of verticalparallel planes;

hanger means spaced along the tops of the wood headers facing each otherin pairs and each having hori zontal portions releasably secured againstthe top surface of the headers and a vertical portion lying in one ofsaid vertical planes, said hanger means including depending stirrupmembers with upper edge portions secured to said vertical portion, andstrap means secured to the lower edges of the stirrup member andreleasably fastened against the side strip;

laminated wood joists each having ahead rail and bottom railinteerconnected by a web and of a height greater than the depth of saidstirrup members whereby the head rail is located a substantial distanceabove the wood header with the lower rail well above the lower flange;

means releasably securing the ends of each joist between the sides of astirrup member including filler blocks extending from rail to rail atboth ends and on .both sides of the web filling the spaces between theweb and stirrup; and

clamping means interconnecting the stirrup members and said blocks andweb in place against compression and tension forces exerted between themetal beams and the joists.

6. The flying form defined in claim including veneer panel forming aflooring and secured to the head rails for bracing said beams and joistsagainst distortion from a geometric squareness.

7. In the construction of a building having at least three parallelpairs of columns the combination of formwork roll-out support means onopposite sides of the central pair of columns and opposing pairs ofrollout support means on the facing sides on each of the two outer pairsof columns including screw jacks supporting rollers at a predeterminedlevel with their axes paralleled in four pairs defining two paralleledformwork roll-out paths;

a pair of parallel spaced metal beams having top and bottom flange meansdisposed at the sides of each roll-out path resting on said respectiverollers; wood headers secured to the top flanges of said beams;

hanger means spaced along the tops of said wood headers extendingtowards each other in spaced pairs and having horizontal flanges securedto the top flange means with stirrup members depending therefrom;

joist means terminally supported within said stirrup means between eachpair of beams with their upper edges disposed colevel within a limitedheight above said headers, and defining a space between said rolloutpaths and intermediate said pair of columns;

veneer panel means secured and marginally terminating within a spaceddistance related to the end of said joists;

means bridging said space and above the adjacent joist means includingpanel means carried thereby colevel with said coextensive veneer panelmeans; and

means for lowering one of said adjacent beams to increase the spacebetween the tops thereof to release the space bridging means from theform support on one side for its removal downwardly from the formsupport on its other side. r 8. In the construction of a building havingatrleast three parallel pairs of columns with formwork support means onopposite sides of the columns of the central pair of columns and on thesides of the two outer pairs of rollers where they face the central pairof columns, said supporting means includingscrew jacks, support ingrollers at a predetermined level with their axes parallel in four pairsdefining two parallel formwork rollout paths; the combination of a pairof parallel spaced beams disposed at the sides of each roll-out pathresting on said respective rollers; nailable members defining the topsof said beams; support means secured in, spaced relation along the topsof said members and extending towards each other in spaced pairsbordering each of said paths and having depending stirrup means; joistmeans terminally supported in said stirrup means between each pair ofsupport means with theirupper I edges disposed above the level of saidmembers, said beams defining open space between saidroll-out paths andintermediate the columns of said central pair of columns;

panel means secured to said joists and marginally terminatingcoextensively a spaced distance related to the end 'of said joists andsaid open space between said roll-out paths;

means bridging said open space above the adjacent headers includingsecondary panel means carried by the beams colevel with said coextensivepanel means; and

means for lowering at least one of said space defining beams to releasethe bridging means for movement downwardly from its supported positionfor removal and reuse.

9. The construction defined in claim 8 in which said secondary panelmeans of said space bridging means is supported on the adjacent ends ofthe joists bordering said space.

10. The construction defined in claim 8 in which said secondary panelmeans includes a frame spanning said space resting on the adjacentmembers and supporting said coextensive panel means.

11. A roll-out flying form comprising parallel spaced metal beams havingfacing channels defined by horizontal head and bottom flanges, each beamhavinga nailable header secured to the upper face of the head flangemarginally coextensive with said head flange edges and a nailable stripspaced substantially above the bottom flange and having a horizontalthickness disposing its exposed face in vertically co-planarrelationship with said header edge,

hanger means correspondingly spaced along the tops of the headers facingeach other in pairs and having horizontal portions releasably securedagainst the tops of 1 the headers and vertical flanges lying in one ofsaid vertical planes, said hanger means including members with upperportions secured to the flanges and g a strap member secured to thelower end thereof releasably fastened to said nailable strip,

a plurality oflaminated wood joist means having head and bottom railsinterconnected by a web and having a heightgreater than the depth ofsaid hanger members whereby the head rail is located a substantialdistance above said head flange and the lower rail is well above thebottom flange, and

means releasably securing the ends of said joists between the sides ofthe hanger members under compression and tension forces including blocksat both ends of the web filling the space between said head and bottomrails,

said releasable securing means including securement elements extendingthrough said blocks, said web and the sides of said stirrup member, withsaid lower rail endwise positioned by said strap and strip.

12. In a knockdown flying form having spaced metal beams disposed withparallel webs and their respective head flanges disposed co-planar withspaced hangers secured to and depending from nailable headers secured tothe respective head flanges and from nailable strips secured to therespective webs, said hangers having members having parallel sidesdisposed in vertical parallel orientation, in combination therewith,laminated wood joists cross-sectionally having an 1 configuration of agreater height than that of the members and terminally resting in saidmembers to plumb and space said metal beams throughout their length,

said joists having spaced nail receivable rails interconnected by a weband symmetrically invertable for either rail to serve as the top railand including filler blocks extending from rail to rail at both ends onboth sides of the web filling the spaces between the web and stirrup,and

fastening means interconnecting the stirrup members and said blocks andwebs to secure them in place against compression and tension forcesoccurring between the metal beams and the joists including aperturemeans through said blocks and web.

13. A prefabricated knockdown roll-out formwork comprising:

parallel spaced metal beams having co-planar head and bottom flanges,each beam having a header of substantial thickness secured to the upperface of its head flange and a nailable side strip secured to the beamabove its bottom flange on facing sides of the two beams, said sidestrip having a horizontal thickness substantially coextensive with thewidth of each header flange to define with the headers vertical parallelplanes;

means spaced along the headers facing each other in pairs and havingportions releasably secured to the headers with a vertical portion lyingin one of said vertical planes including depending support members withupper portions secured to said vertical portions and lower portionsthereof fastened to said side strip;

joist means defining nailable head and bottom rails interconnected by aweb and having a height greater than the depth of said support membersto locate the head rail an appreciable distance above said head flangeswith the lower rail located well above the lower flange;

means releasably securing the ends of said joist means to said supportmembers against relative tension and compression forces exerted betweensaid beams and said joist means; and

plywood panel means secured to the head rails of said joist means tosupport poured cement for a floor slab and to brace said formworkagainst horizontal strains.

14. The device defined in claim 13 in which said metal beams havechannels along their sides opposite to said spaced means within which toaccommodate such spaced means on another beam in nesting relation whensaid beams are side-by-side to protect said spaced means from damageduring storage and transportation. l l

1. Prefabricated knockdown roll-out formwork for support on height andlevel adjustable screw jacks having heads including rollers defining aroll-out path and friction shoes adjustable to support said formworkabove said rollers a predetermined distance is said path, said formworkcomprising: parallel spaced metal beams resting on said jacks and havingcoplanar head and bottom flanges, each beam having a nailable header ofsubstantial thickness secured to the upper face of its head flange and aside strip of nailable material spaced above the bottom flanges andsecured to the beams on facing sides of the two beams, said side striphaving a horizontal thickness substantially coextensive with the lateralextension of each head flange to define with the headers verticalparallel planes; hanger means spaced along the headers in manner facingeach other in pairs and having horizontal portions releasably securedagainst the top surfaces of the respective headers and vertical flangeslying in one of said vertical planes, and hanger means includingdepending stirrup members with upper portions secured to said verticalflanges and horizontal strap means secured to lower portions thereof andreleasably fastened to said side strip; laminated wood joist meansdefining nailable head and bottom rails interconnected by a web andhaving a height greater than the vertical depth of said stirrup membersto locate the head rails a substantial distance above said head flangewith the lower rail located well above the lower flange; means inCludingbolts releasably securing the ends of said joist means between the sidesof the stirrup members against relative tension and compression forcesexerted between said beams and said joist means; and plywood panel meanssecured to the head rails of said joisst means to support pouredconcrete for a floor slab and to brace said formwork against horizontalstrains.
 2. The construction defined in claim 1 in which said joistmeans including said joist rails on opposite sides of the web engage thesides of said stirrup member under compression and have aperture meanstherethrough for the bolt means arranged equidistant from said rails forinverted reuse of the joist means in said stirrup members.
 3. Theconstruction defined in claim 2 in which said joist means are square attheir ends and collectively engage said headers and strips to plumb thebeams and support them against rotation under load as they rest upon thescrew jack heads and when the formwork is supported by crane at formworkcorners.
 4. The construction defined in claim 2 in which said fillerblocks and rails at the joists include plywood panel elements extendingacross said wood headers and are supported in abutting relation withsaid plywood panel means by said filler blocks and rail ends of saidjoists.
 5. A flying form comprising: a pair of parallel spaced metalbeams disposed with parallel flanges along the head and bottom of theirwebs, respectively; a wood header of substantial thickness rigidlysecured to the upper face of the head flange and colevel wood stripssecured a spaced distance above the bottom flange against the facingsides of said beam webs, said strips having a horizontal thicknesssubstantially equal to the width of each head flange to define with thehead flanges a pair of vertical parallel planes; hanger means spacedalong the tops of the wood headers facing each other in pairs and eachhaving horizontal portions releasably secured against the top surface ofthe headers and a vertical portion lying in one of said vertical planes,said hanger means including depending stirrup members with upper edgeportions secured to said vertical portion, and strap means secured tothe lower edges of the stirrup member and releasably fastened againstthe side strip; laminated wood joists each having a head rail and bottomrail inteerconnected by a web and of a height greater than the depth ofsaid stirrup members whereby the head rail is located a substantialdistance above the wood header with the lower rail well above the lowerflange; means releasably securing the ends of each joist between thesides of a stirrup member including filler blocks extending from rail torail at both ends and on both sides of the web filling the spacesbetween the web and stirrup; and clamping means interconnecting thestirrup members and said blocks and web in place against compression andtension forces exerted between the metal beams and the joists.
 6. Theflying form defined in claim 5 including veneer panel forming a flooringand secured to the head rails for bracing said beams and joists againstdistortion from a geometric squareness.
 7. In the construction of abuilding having at least three parallel pairs of columns the combinationof formwork roll-out support means on opposite sides of the central pairof columns and opposing pairs of roll-out support means on the facingsides on each of the two outer pairs of columns including screw jackssupporting rollers at a predetermined level with their axes paralleledin four pairs defining two paralleled formwork roll-out paths; a pair ofparallel spaced metal beams having top and bottom flange means disposedat the sides of each roll-out path resting on said respective rollers;wood headers secured to the top flanges of said beams; hanger meansspaced along the tops of said wood headers extending towards each otherin spaced pairs and having horizontal flanges secured to the top flangemeans with stirrup meMbers depending therefrom; joist means terminallysupported within said stirrup means between each pair of beams withtheir upper edges disposed colevel within a limited height above saidheaders, and defining a space between said roll-out paths andintermediate said pair of columns; veneer panel means secured andmarginally terminating within a spaced distance related to the end ofsaid joists; means bridging said space and above the adjacent joistmeans including panel means carried thereby colevel with saidcoextensive veneer panel means; and means for lowering one of saidadjacent beams to increase the space between the tops thereof to releasethe space bridging means from the form support on one side for itsremoval downwardly from the form support on its other side.
 8. In theconstruction of a building having at least three parallel pairs ofcolumns with formwork support means on opposite sides of the columns ofthe central pair of columns and on the sides of the two outer pairs ofrollers where they face the central pair of columns, said supportingmeans including screw jacks, supporting rollers at a predetermined levelwith their axes parallel in four pairs defining two parallel formworkroll-out paths; the combination of a pair of parallel spaced beamsdisposed at the sides of each roll-out path resting on said respectiverollers; nailable members defining the tops of said beams; support meanssecured in spaced relation along the tops of said members and extendingtowards each other in spaced pairs bordering each of said paths andhaving depending stirrup means; joist means terminally supported in saidstirrup means between each pair of support means with their upper edgesdisposed above the level of said members, said beams defining open spacebetween said roll-out paths and intermediate the columns of said centralpair of columns; panel means secured to said joists and marginallyterminating coextensively a spaced distance related to the end of saidjoists and said open space between said roll-out paths; means bridgingsaid open space above the adjacent headers including secondary panelmeans carried by the beams colevel with said coextensive panel means;and means for lowering at least one of said space defining beams torelease the bridging means for movement downwardly from its supportedposition for removal and reuse.
 9. The construction defined in claim 8in which said secondary panel means of said space bridging means issupported on the adjacent ends of the joists bordering said space. 10.The construction defined in claim 8 in which said secondary panel meansincludes a frame spanning said space resting on the adjacent members andsupporting said coextensive panel means.
 11. A roll-out flying formcomprising parallel spaced metal beams having facing channels defined byhorizontal head and bottom flanges, each beam having a nailable headersecured to the upper face of the head flange marginally coextensive withsaid head flange edges and a nailable strip spaced substantially abovethe bottom flange and having a horizontal thickness disposing itsexposed face in vertically co-planar relationship with said header edge,hanger means correspondingly spaced along the tops of the headers facingeach other in pairs and having horizontal portions releasably securedagainst the tops of the headers and vertical flanges lying in one ofsaid vertical planes, said hanger means including members with upperportions secured to the flanges and a strap member secured to the lowerend thereof releasably fastened to said nailable strip, a plurality oflaminated wood joist means having head and bottom rails interconnectedby a web and having a height greater than the depth of said hangermembers whereby the head rail is located a substantial distance abovesaid head flange and the lower rail is well above the bottom flange, andmeans releasably securing the ends of said joists between the sides ofthe hAnger members under compression and tension forces including blocksat both ends of the web filling the space between said head and bottomrails, said releasable securing means including securement elementsextending through said blocks, said web and the sides of said stirrupmember, with said lower rail endwise positioned by said strap and strip.12. In a knockdown flying form having spaced metal beams disposed withparallel webs and their respective head flanges disposed co-planar withspaced hangers secured to and depending from nailable headers secured tothe respective head flanges and from nailable strips secured to therespective webs, said hangers having members having parallel sidesdisposed in vertical parallel orientation, in combination therewith,laminated wood joists cross-sectionally having an ''''I''''configuration of a greater height than that of the members andterminally resting in said members to plumb and space said metal beamsthroughout their length, said joists having spaced nail receivable railsinterconnected by a web and symmetrically invertable for either rail toserve as the top rail and including filler blocks extending from rail torail at both ends on both sides of the web filling the spaces betweenthe web and stirrup, and fastening means interconnecting the stirrupmembers and said blocks and webs to secure them in place againstcompression and tension forces occurring between the metal beams and thejoists including aperture means through said blocks and web.
 13. Aprefabricated knockdown roll-out formwork comprising: parallel spacedmetal beams having co-planar head and bottom flanges, each beam having aheader of substantial thickness secured to the upper face of its headflange and a nailable side strip secured to the beam above its bottomflange on facing sides of the two beams, said side strip having ahorizontal thickness substantially coextensive with the width of eachheader flange to define with the headers vertical parallel planes; meansspaced along the headers facing each other in pairs and having portionsreleasably secured to the headers with a vertical portion lying in oneof said vertical planes including depending support members with upperportions secured to said vertical portions and lower portions thereoffastened to said side strip; joist means defining nailable head andbottom rails interconnected by a web and having a height greater thanthe depth of said support members to locate the head rail an appreciabledistance above said head flanges with the lower rail located well abovethe lower flange; means releasably securing the ends of said joist meansto said support members against relative tension and compression forcesexerted between said beams and said joist means; and plywood panel meanssecured to the head rails of said joist means to support poured cementfor a floor slab and to brace said formwork against horizontal strains.14. The device defined in claim 13 in which said metal beams havechannels along their sides opposite to said spaced means within which toaccommodate such spaced means on another beam in nesting relation whensaid beams are side-by-side to protect said spaced means from damageduring storage and transportation.